Table of Contents
Advertisement
C H A P T E R
4 :
4 GETTING TO KNOW THE
OPERA™ FRAMEWORK
Description of the Underlying Concept of OPERA™
and the Framework Menu Options and Command
Line Parameters.
O
PERA™ is based on a modern open architecture which offers a high
degree of flexibility as well as room for future technology advances.
The system can be visualized consisting of general modules, which
will be needed for various kinds of measurements, called the
framework
, as well as some specific modules that implement a detailed
functionality, called
In this chapter the concept behind OPERA™ will be explained. We will start by
defining the data acquisition part of OPERA™. Following this section is a
description of the OPERA™ framework as it is used for online measurements
and the evaluation of previously acquired data. The performance
measurements from batch files will be explained. Remember, this chapter
describes the general operation of the system, i.e. commands that all available
algorithm plug-ins have in common. The descriptions of the plug-in specific
topics are found in Chapter 5 or Chapter 6, respectively. Users of the Software
Suite may skip the explanation of the data acquisition process, since this feature
is not available in their version of OPERA™.
4.1 General Concept
Since OPERA™ supports a wide variety of interfaces, it was decided to move the
data acquisition part of the measurement into a separate program, called
OptiCall™. The evaluation of the recorded data is handled by the OPERA™
Framework. This split enables both parts of the software to focus on their special
task and both parts are easier to use than one monolithic, functionality
overloaded program. This way it is also possible to first acquire the data by e.g.
establishing a test call on a telephone network, and then to evaluate the data
off-line using various algorithms,without having to repeat the data acquisition.
On VoIP networks, especially it is most valuable PSQM, PESQ and Echo
parameters can be evaluated for exactly the same situation on the network
(without having to repeat the call for the next algorithm). The standard set-up
creates a connection from originator to terminator. Once this connection is
established, the test file is sent from the terminating side back to the originating
G E T T I N G
T O
K N O W
F R A M E W O R K
plug-ins
.
29
T H E
O P E R A ™
4
Chapter
of
Advertisement
Table of Contents
